Rocket.Chat: Apple Sign-In skips JWT claims validation, allowing expired and cross-audience token replay

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Summary

CVECVE-2026-55759
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 22:16:49 UTC
Updated2026-06-24 22:16:49 UTC
DescriptionRocket.Chat is an open-source, secure, fully customizable communications platform. Prior to 8.5.1, 8.4.4, 8.3.6, 8.2.6, 8.1.6, 8.0.7, and 7.10.13, Rocket.Chat's Apple Sign-In handler verifies JWT signatures but skips claims validation. Any Apple-signed JWT with a non-empty iss is accepted regardless of aud, exp, nbf, or nonce. An attacker who obtains a target user's Apple identity token (from server logs, an intercepted sign-in flow, or another application sharing the same Apple developer team) can replay it to authenticate as that user, with no expiration on the replay window. This vulnerability is fixed in 8.5.1, 8.4.4, 8.3.6, 8.2.6, 8.1.6, 8.0.7, and 7.10.13.

Risk And Classification

Primary CVSS: v3.1 7.4 HIGH from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Problem Types: CWE-287 | CWE-294 | CWE-287 CWE-287: Improper Authentication | CWE-294 CWE-294: Authentication Bypass by Capture-replay

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA RocketChat Rocket.Chat affected >= 8.5.0-rc.0, < 8.5.1 Not specified
CNA RocketChat Rocket.Chat affected >= 8.4.0-rc.0, < 8.4.4 Not specified
CNA RocketChat Rocket.Chat affected >= 8.3.0-rc.0, < 8.3.6 Not specified
CNA RocketChat Rocket.Chat affected >= 8.2.0-rc.0, < 8.2.6 Not specified
CNA RocketChat Rocket.Chat affected >= 8.1.0-rc.0, < 8.1.6 Not specified
CNA RocketChat Rocket.Chat affected >= 7.11.0-rc.0, < 8.0.7 Not specified
CNA RocketChat Rocket.Chat affected < 7.10.13 Not specified

References

ReferenceSourceLinkTags
github.com/RocketChat/Rocket.Chat/security/advisories/GHSA-c75c-5hc7-j4vp [email protected] github.com
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